Hello Vinod,
Good day!
As per your suggestion I am able to find the user exit in OB28. But after I execute RGUGBR00, When I try to do the postings in FB01 it gives me a ABAP DUMP. I think the issue is in below Auto-generated code (it is generated by program RGUGBR00)
FORM VALCHCK_2ZFI0001002
CHANGING
RES000.
DATA: RES001 LIKE D_BOOL.
* Exit evaluation :RES000 *
RES000 = B_TRUE.
PERFORM U910(ZGGBR000)
IF FOUND
CHANGING
RES000.
IF G_TRACE = B_TRUE .
PERFORM send_bool_result
USING
'003'
0
BE_EXIT
'U910'
RES000
SPACE.